1. 立方：本人一篇影响因子4.0的SCI文章中需要求助立方(cubic)到六方(rhombohedral)的转换矩阵(Transformation matrix). 末状态为六方(rhombohedral)结构,晶格常数为a1=0.4023nm,角度β=89.91度. 定义:转换矩阵(Transformation matrix)为

2.

2. 三次方程：文章摘要:通过对缙云麻鸭0~150日龄体重的测定及与三次方程(Cubic)的拟合. 结果表明:缙云麻鸭Ⅰ系和Ⅱ系,公鸭0-30日龄体重均高于母鸭,60-150日齿体重均低于母鸭. 同时,公鸭的生长曲线与Cubic方程的拟合度(0.996,0.996)分别高于母鸭(0.988,

3. cubic：cu.; 立方的

1. 立方的
    Cubic is used in front of units of length to form units of volume such as ''cubic metre'' and ''cubic foot''.

    e.g. ...3 billion cubic metres of soil.
           30亿土方

1. having three dimensions

    Synonym: three-dimensional